12) Mortgage Servicing Rights: Assumptions used in determining MSR value (Details) - Decimal	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Text Block [Abstract]
Prepayment Speeds	11.90	15.60
Average Life in Years of MSR	6 years 8 months 19 days	5 years 3 months 19 days
Discount Rate	9.50	9.50